EXP in dynamis will most likely be normal, non-abyssea EXP. e.g. level 89s are not going to get massive amounts of EXP.

I believe the take away for getting exp in Dynamis was the lowering of the currency drop rate.
Nothing to do with the EXP. It's because the currency market would be flooded if people could run every day and produce the same amount of currency each day.